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The first thing we want to do is change the first equation so it's either all x's or all y's, we don't want a mixture. Now looking at the bottom equation, we can rearrange it by adding y to both sides. Th...

First of all we must consider the fraction. To eliminate this we multiply both sides through by 3x-1. We then end up with y(3x-1)=(x+2)+2(3x-1). The next step is to expand out the brackets and collate ter...

Mixed number -> top heavy fraction: 4 + 5/7 = ((47)+5)/7 = (28+5)/7 = 33/7 2+ 1/3 = ((23)+1)/3 = (6+1)/3 = 7/3 Common denominator by multiplying by each others: 33/7 = (333)/(73) = 99...

Before you try to work out the probability, establish the following answers from the question and jot them down. How many items are there in total? After something is chosen, is it put back before the nex...

Look for the corresponding letters to each number. So, as an example those with a. remember that the + or - before it tells us whether it is to be added or subtracted

There are 2a-a+3a so that = 4a...